Richard n



(No Model.)

R. N. DYER. MANUPAGTURE 0F INGANDESOENT ELEOTRIG LAMPS.

No. 429,608." I PatentedJune10,1890.

nu: NORRIS PETERS co., mom-mum, wAsnmaYoN, m c.

RICHARD N. DYER,

rPATENT OFFICE.

OF NEW YORK, N. Y.

MANUFACTURE OF INCAND'ESCENT ELECTRIC LAMPS.

SPECIFICATION forming part of Letters Patent No. 429,608, dated June 10,1890.

Application filed June 5, 1884- Seria1 No. 133,997. (No model.) i

To all whom it may concern.-

Be it known that I, RICHARD N. DYER, of New York city, in the county andState of New York, have invented a certain new and useful Improvement inthe Method of Manufacturing Incandescing Electric Lamps, of which thefollowing is a specification.

My invention relates to the method of manufacturing incandescingelectric lamps having loop-shaped conductors, wherein the loops arestraightened or changed in form or are prevented from assuming a bent orirregular shape by subjecting them to a constant strain during theoperation of exhausting the lamps, which includes the gradual heating ofthe loops to high incandescence by an electric current, the strain beingproduced by hanging weights on the ends of'the loops. This broad methodforms no part of my invention. In carrying out this method heretofore ithas been found necessary to attach to each lamp globe or bulb anexhaust-tube longer than usual, and after the operation of exhaustingthe lamp was completed this tube was first sealed some distance fromthelampglobe and the lamp removed from the pump. Then by manipulatingthe lamp the weight was unhooked from the loop and dropped into thetube, and this tube was then sealed off from the lamp.

The principal objectI have in view is to simplify and cheapen thismethod by releasing the weight from the loop while the lamp is on thepump, so that the lamp can be sealed off directly from the pump. This Iaccom plish by releasing the weight magnetically.

In carrying out my invention 1 provide the wire weight with an end ofiron, steel, or other magnetic material, or I make the entire weight ofiron or steel. The weight is released by means of a magnet, which, whenbrought close to the exhaust-tube, attracts the weight and enables it tobe moved vertically and axially to unhook it from the loop. It can thenbe dropped into the vessel containing the drying agent and the lampsealed off directly from the pump. This simplifies and cheapens themethod of handling the weight and removing it from the lamp, and alsodoes away, with the necessity of using a long exhaust-tube-that is tosay, the lamp can be sealed directly 01f from the pump by one operation,since the strain is applied to the carbon-loop, and is removed therefromwhile the lamp is still connected with the pump.

It is evident that with a magnetic weighta magnet can be used forattaching the weight to the loop as well as for detaching it, and it isalso evident that the magnetic weight could be used to advantage withthe double-sealing method employed heretofore, and a magnet be used forreleasing or attaching the weight, or'for both attaching it to andreleasing it from the loop. A further use of a magnetic weight is toincrease the strain or pull upon the loop by means of anexternally-applied magnetic force. In this way if the weight provedinsufficient to straighten the loop or bring it to the desired shape amagnet could be used to draw downwardly upon the weight.

It might be found desirable to make the magnetic weights light and tostraighten or shape the loops by an externally-applied magnetic force,the magnet being mounted in position to act constantly or being broughtinto action, as desired.

' The invention is illustrated in the accompanying drawings, Figure 1 ofwhich is an elevation of a lamp in position on a pump with the weighthanging on the loop, the weight being shown in dotted lines'as releasedfrom the loop and dropped out of the lamp-globe.

A is the drying-chamber of the pump, and a l) c the mercury drop-tubes.The chamber A has a tapering tube (1, receiving the exhaust-tube B fromthe lamp globe or bulb O. V D is the carbon-loop of the lamp, to whichis hung the magnetic weight. This is composed of a hook-end wire e, ofcopper or platinum, and abody f, of iron, steel, or other magneticmaterial, or the entire weight, including the wire, may be of magneticmaterial.

E is a permanent or electro magnet, which may be used to unhook theweight from the loop or to hook it thereon, or. to increase the pull ofthe weight on the loop.

By the preferred method, after the operation of exhausting the lamp iscompleted, during which operation the weight is hung on the loop, asshown in full lines in the drawings, the magnet E is brought close totube B, and the weight is raised and turned to un hook it from the loop,and is then allowed to drop into chamber A, as shown in dotted lines, orthe hook on the end of the weight may be straight, or nearly so, topermit the hook to be drawn laterallv off the loop without raising theweight. After the weight is dropped into the chamber A the lamp issealed cit at the point 9.

A solenoid-coil F may be used instead of a magnet for attracting ormanipulating the magnetic weight, as shown in Fig. 2, which is anelevation of the lower end of a lamp before sealing off, with the weightattached to the carbon.

WVh at I claim is 1. The method of manufacturing incandescing electriclamps having loop-conductors, consisting in subjecting theloop-conductors to strain during the exhausting process by weights hnngto them, removing such weights from the lamp-globes while the lamps arestill connected with the pumps, and then sealing 01? the lamps,substantially as set forth.

2. The improvement in the method described of straightening theloop-shaped c011- ductor of an incandescing electric lamp by hanging aweight to it during the exhausting process, which improvement consistsin manipulating the weight by magnetic force exerted external to theglass globe and its exhaust-tube and acting upon the weight through theglass, substantially as and for the purposes set forth.

3. The method of manufacturing incandescing electric lamps having carbonconductors, consisting in subjecting such carbon conductors to strainduring the exhausting process and while such conductors are being heatedby an electric current, and removing such strain while the lamps arestill connected with the pumps, whereby the lamps can be sealed off fromthe pumps by one operation, substantially as set forth.

This specification signed and witnessed this 1st day of May, 1884.

RICHARD N. DYER.

\Vitnesses:

ALFRED W. KIDDLE, E. C. ROWLAND.

